91 ford: 6 cyl e4od trans.shifts hard.im driving - Answered by a verified Ford Mechanic I was told their is a sensor for my transmission that has went bad, I need a wiring diagram/color code of the plug that goes into the neutral safelty switch of the transmission. 94 Ford F-350 2WD Eng. 460 Trans. E4OD. Sep 14, 2010 · I have the Ford shop manual but it does not have the MLPS wiring diagram and what the color codes are. although step number 1 for removing the transmission is to remove the negative battery cables which was never done by the so called technician.. Home > TRANSMISSION PARTS AUTOMATIC TRANSMISSION KITS > Ford Rear Wheel Drive > E4OD 4R100 > Solenoids & Switches > 26389A E4OD solenoid wire harness repair kit 1989-7/94. E4OD Transmission solenoid wire harness repair 1989-7/94.